On 10/15/2019 08:11 PM, Qian Cai wrote: > The x86 will crash with linux-next during boot due to this series (v5) with the > config below plus CONFIG_DEBUG_VM_PGTABLE=y. I am not sure if v6 would address > it. > > https://raw.githubusercontent.com/cailca/linux-mm/master/x86.config > > [ 33.862600][ T1] page:ffffea0009000000 is uninitialized and poisoned > [ 33.862608][ T1] raw: ffffffffffffffff ffffffffffffffff ffffffffffffffff > ffffff871140][ T1] ? _raw_spin_unlock_irq+0x27/0x40 > [ 33.871140][ T1] ? rest_init+0x307/0x307 > [ 33.871140][ T1] kernel_init+0x11/0x139 > [ 33.871140][ T1] ? rest_init+0x307/0x307 > [ 33.871140][ T1] ret_from_fork+0x27/0x50 > [ 33.871140][ T1] Modules linked in: > [ 33.871140][ T1] ---[ end trace e99d392b0f7befbd ]--- > [ 33.871140][ T1] RIP: 0010:alloc_gigantic_page_order+0x3fe/0x490 Hmm, with defconfig (DEBUG_VM=y and DEBUG_VM_PGTABLE=y) it does not crash but with the config above, it does. Just wondering if it is possible that these pages might not been initialized yet because DEFERRED_STRUCT_PAGE_INIT=y ? [ 13.898549][ T1] page:ffffea0005000000 is uninitialized and poisoned [ 13.898549][ T1] raw: ffffffffffffffff ffffffffffffffff ffffffffffffffff ffffffffffffffff [ 13.898549][ T1] raw: ffffffffffffffff ffffffffffffffff ffffffffffffffff ffffffffffffffff [ 13.898549][ T1] page dumped because: VM_BUG_ON_PAGE(PagePoisoned(p)) [ 13.898549][ T1] ------------[ cut here ]------------ [ 13.898549][ T1] kernel BUG at ./include/linux/mm.h:1107! [ 13.898549][ T1] invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI [ 13.898549][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.4.0-rc3-next-20191015+ #
